Finding the Third Proportional to 339,412 and 670,260.50

Step by Step Solution

1. Step 1: Write the proportion equation
   339,412 : 670,260.50 = 670,260.50 : x
2. Step 2: Convert to fraction form
   339,412/670,260.50 = 670,260.50/x
3. Step 3: Cross multiply
   339,412x = 670,260.50 × 670,260.50
4. Step 4: Simplify right side
   339,412x = 449,249,137,860.25
5. Step 5: Solve for x
   x = 449,249,137,860.25/339,412
6. Step 6: Final answer
   x = 1,323,610.06